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OpenStudy (lilday12):
A railroad car with a mass of 30,000 kg is moving at 2.0 m/s when it runs into an at-rest freight car with an equal mass. The cars lock together. What is their final velocity? A. 60,000 kg·m/s B. 1.0 m/s C. 0.5 m/s D. 2.0 m/s
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OpenStudy (irishboy123):
compare momentum before with momentum after the collision. it should be the same, giving you your answer
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